Valve timing-gear of rotary engines



Dec. 29, 1964 L. PERAS VALVE TIMING-GEAR OF ROTARY ENGINES 2Sheets-Sheet 1 Filed June 26, 1961 IN VENToR LucIEN PER/9S A 7"TOR/VE Y3m, 0W4, Mwzma Dec. 29, 1964 1.. PERAS VALVE TIMING-GEAR OF ROTARY mamas2 Sheets-Sheet 2 Filed June 26, 1961 'I/VVENTOR L uc/EA/ P x:

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United States Patent 4 Claims. Zcl. 12s s The present invention relatesto rotary explosion engines and is concerned with the valve timing-gearof these engines, more particularly the control of the valves, theignition system and the oil and fuel pumps.

The improvements forming the object of the invention consist essentiallyin ensuring this control by means of a single cam-shaft.

The valves, which are parallel to the axis of the engine, are located inthe combustion chambers formed in the cylinder head which is arrangedlaterally to the rotor.

In order to take account of the distances of the concentrically-disposed valves from the cam-shaft, the valve push-rods aremade of different lengths and the pawls are given different forms.

All the admission cams are given the same profile, and all the exhaustcams have also. the same profile in order to facilitate the manufactureof the cam-shaft.

In the accompanying drawings, there has been shown by way of exampleonly, a form of construction of a rotary engine with a rotor having anepicycloidal profile with four teeth, rotating eccentrically in a statorwith five teeth which form the envelope of the rotor teeth and comprisefive points of contact.

FIG. 1 is a cross-section of the rotary engine, taken in a plane passingthrough the axis of the engine.

FIG. 2 is a transverse section showing the arrangement of the valvetiming-gear members.

FIGS. 3, 4, and 5 show different forms of construction of a device forcontrolling the valves by pawls, push-rods and rocker-arms, according tothe positions of the valves.

Referring now to the drawings, and more particularly to FIG. 1, it canbe seen that the rotor 1 has four teeth 2 and rotates eccentrically in astator having five teeth 4 which form the envelope of the teeth of therotor.

The rotor 1 is mounted on the eccentric portion 1 of the shaft.

The combustion chambers 6 are hollowed out in the cylinder head 5arranged'laterally to the rotor; the admission and exhaust are effectedby the valves 7. These valves are parallel to the axis 8 of the engine,and the valve stems come level with a single plane 9 perpendicular tothe axis 8.

The valve timing-gear of this engine is characterized by the fact thatit is operated by a single cam-shaft 10, disposed perpendicular to theaxis 8 of the engine and driven by a pair of helicoidal gear pinions 11.

This camshaft serves to drive the valves 7 which are individuallydesignated in FIG. 2 by the letters A-B-C- D-E-F-GHIJ. There areprovidedseveral groups of similar controls common to a number of valves andshown in detail in FIGS. 3 to 5. Thus in the embodiment shown, thecontrol which is the subject matter of FIG. 3 is common to the valves B,G, I, J and comprises for each Patented Dec. 29, 1964 valve .a V-shapedtongue 12, cooperating with a control rod 13 interposed between saidtongue and a rocker 14 intended to actuate the corresponding valve.

The control which is the subject matter of FIG. 4 is common to thevalves D and E and comprises for each valve a straight tongue 20cooperating with a control rod 21 of a rocker 22 intended to actuate thecorresponding valve.

FIG. 5 shows, on the one hand, a control common to the valves A and Hcomprising a tongue 23, a control rod 24, and a rocker 25 intended toactuate the corresponding valve and, on the other hand, a controlcomnion to the valves C and F comprising a tongue 26, a control rod 27and a rocker 28 intended to actuate the corresponding valve.

The cam-shaft also carries the eccentric cam 15 which operates the fuelpump 16, and the shaft also drives directly from its twoextremities theignition device 17 and the oil-pump 18.

The advantage of this arrangement is that a single pair of pinions onlyis required to drive the cam-shaft, the ignition device, the oil-pumpand the fuel pump.

I claim:

1. Improvements in the timing-gear of rotary explosion engines of thekind having a rotor with teeth rotating eccentrically in a toothedstator, comprising a cylinder head, lateral chambers in the head, adriving shaft, valves arranged in said chambers parallel to the axis ofsaid driving shaft, a single cam-shaft having a plurality of cans.atfixed thereto, disposed perpendicular to the axis of the drivingshaft, means driving said cam-shaft, control elements for the valveslocated at different distances from the cam-shaft and means of differentlengths and forms acting on said control elements and actuated by thecams.

2v Improvements in valve timing-gear in accordance with claim 1, whereinsaid means driving said cam-shaft includes a single pair of pinions.

3. Improvements in valve timing-gear in accordance with claim 1, inwhich the engine also includes an ignition device and an oil pump andwherein said single cam-shaft also drives directly from its extremities,the ignition device and the oil-pump respectively.

4. Improvements in valve timing-gear in accordance with claim 1, inwhich the engine also includes a fuel pump that is also driven by aneccentric cam mounted on the said single cam-shaft.

References Cited by the Examiner UNITED STATES PATENTS 896,485 8/03Tinlin 123-15 1,302,504 5/19 Briggs 123-16 1,575,860 3/26 Monk 123-142,162,771 6/39 Winans 1238 2,238,649 4/41 Kishline 123-1465 2,280,7424/42 Bowers 12314 2,363,804 11/44 Reiland 123-l95 2,482,332 9/49 ECkClI123l95 2,904,019 9/59 Shimomura 123-8 X JOSEPH H. BRANSON, 1a., PrimaryExaminer.

KARL J. ALBRECHT, Examiner.

1. IMPROVEMENTS IN THE TIMING-GEAR OF ROTARY EXPLOSION ENGINES OF THEKIND HAVING A ROTOR WITH TEETH ROTATING ECCENTRICALLY IN A TOOTHEDSTATOR, COMPRISING A CYLINDER HEAD, LATERAL CHAMBERS IN THE HEAD, ADRIVING SHAFT, VALVES ARRANGED IN SAID CHAMBERS PARALLEL TO THE AXIS OFSAID DRIVING SHAFT, A SINGLE CAM-SHAFT HAVING A PLURALITY OF CANSAFFIXED THERETO, DISPOSED PERPENDICULAR TO THE AXIS OF THE DRIVINGSHAFT, MEANS DRIVING SAID CAM-SHAFT, CONTROL ELEMENTS FOR THE VALVESLOCATED AT DIFFERENT DISTANCES FROM THE CAM-SHAFT AND MEANS OF DIFFERENTLENGTHS AND FORMS ACTING ON SAID CONTROL ELEMENTS AND ACTUATED BY THECAMS.